package net.softsword.cassandrabrowser.console;

/*
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 */

public class CliUtils {
    /*
     * Strips leading and trailing "'" characters, and handles and escaped
     * characters such as \n, \r, etc. [Shameless clone from hive.]
     */
    public static String unescapeSQLString(String b) {
        assert (b.charAt(0) == '\'');
        assert (b.charAt(b.length() - 1) == '\'');
        StringBuilder sb = new StringBuilder(b.length());

        for (int i = 1; i + 1 < b.length(); i++) {
            if (b.charAt(i) == '\\' && i + 2 < b.length()) {
                char n = b.charAt(i + 1);
                switch (n) {
                case '0':
                    sb.append("\0");
                    break;
                case '\'':
                    sb.append("'");
                    break;
                case '"':
                    sb.append("\"");
                    break;
                case 'b':
                    sb.append("\b");
                    break;
                case 'n':
                    sb.append("\n");
                    break;
                case 'r':
                    sb.append("\r");
                    break;
                case 't':
                    sb.append("\t");
                    break;
                case 'Z':
                    sb.append("\u001A");
                    break;
                case '\\':
                    sb.append("\\");
                    break;
                case '%':
                    sb.append("%");
                    break;
                case '_':
                    sb.append("_");
                    break;
                default:
                    sb.append(n);
                }
            } else {
                sb.append(b.charAt(i));
            }
        }
        return sb.toString();
    }
}
